<?php

// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

use InvalidArgumentException;
use think\db\Query;
use think\exception\ValidateException;
use think\model\Collection as ModelCollection;
use think\model\Relation;
use think\model\relation\BelongsTo;
use think\model\relation\BelongsToMany;
use think\model\relation\HasMany;
use think\model\relation\HasManyThrough;
use think\model\relation\HasOne;
use think\model\relation\MorphMany;
use think\model\relation\MorphOne;
use think\model\relation\MorphTo;

/**
 * Class Model
 * @package think
 * @mixin Query
 */
abstract class Model implements \JsonSerializable, \ArrayAccess {

  // 数据库查询对象池
  protected static $links = [];
  // 数据库配置
  protected $connection = [];
  // 父关联模型对象
  protected $parent;
  // 数据库查询对象
  protected $query;
  // 当前模型名称
  protected $name;
  // 数据表名称
  protected $table;
  // 当前类名称
  protected $class;
  // 回调事件
  private static $event = [];
  // 错误信息
  protected $error;
  // 字段验证规则
  protected $validate;
  // 数据表主键 复合主键使用数组定义 不设置则自动获取
  protected $pk;
  // 数据表字段信息 留空则自动获取
  protected $field = [];
  // 只读字段
  protected $readonly = [];
  // 显示属性
  protected $visible = [];
  // 隐藏属性
  protected $hidden = [];
  // 追加属性
  protected $append = [];
  // 数据信息
  protected $data = [];
  // 原始数据
  protected $origin = [];
  // 关联模型
  protected $relation = [];
  // 保存自动完成列表
  protected $auto = [];
  // 新增自动完成列表
  protected $insert = [];
  // 更新自动完成列表
  protected $update = [];
  // 是否需要自动写入时间戳 如果设置为字符串 则表示时间字段的类型
  protected $autoWriteTimestamp;
  // 创建时间字段
  protected $createTime = 'create_time';
  // 更新时间字段
  protected $updateTime = 'update_time';
  // 时间字段取出后的默认时间格式
  protected $dateFormat;
  // 字段类型或者格式转换
  protected $type = [];
  // 是否为更新数据
  protected $isUpdate = false;
  // 更新条件
  protected $updateWhere;
  // 验证失败是否抛出异常
  protected $failException = false;
  // 全局查询范围
  protected $useGlobalScope = true;
  // 是否采用批量验证
  protected $batchValidate = false;
  // 查询数据集对象
  protected $resultSetType;
  // 关联自动写入
  protected $relationWrite;
  //自动获取model用户信息
  protected $user_data;

  /**
   * 初始化过的模型.
   *
   * @var array
   */
  protected static $initialized = [];

  /**
   * 构造方法
   * @access public
   * @param array|object $data 数据
   */
  public function __construct($data = []) {
    if (is_object($data)) {
      $this->data = get_object_vars($data);
    } else {
      $this->data = $data;
    }
    // 记录原始数据
    $this->origin = $this->data;

    // 当前类名
    $this->class = get_called_class();

    if (empty($this->name)) {
      // 当前模型名
      $name = str_replace('\\', '/', $this->class);
      $this->name = basename($name);
      if (Config::get('class_suffix')) {
        $suffix = basename(dirname($name));
        $this->name = substr($this->name, 0, -strlen($suffix));
      }
    }

    if (is_null($this->autoWriteTimestamp)) {
      // 自动写入时间戳
      $this->autoWriteTimestamp = $this->getQuery()->getConfig('auto_timestamp');
    }

    if (is_null($this->dateFormat)) {
      // 设置时间戳格式
      $this->dateFormat = $this->getQuery()->getConfig('datetime_format');
    }

    if (is_null($this->resultSetType)) {
      $this->resultSetType = $this->getQuery()->getConfig('resultset_type');
    }
    //初始化用户信息
    $this->set_user_info();
    // 执行初始化操作
    $this->initialize();
  }

  /**
   * 创建模型的查询对象
   * @access protected
   * @return Query
   */
  protected function buildQuery() {
    // 合并数据库配置
    if (!empty($this->connection)) {
      if (is_array($this->connection)) {
        $connection = array_merge(Config::get('database'), $this->connection);
      } else {
        $connection = $this->connection;
      }
    } else {
      $connection = [];
    }

    $con = Db::connect($connection);
    // 设置当前模型 确保查询返回模型对象
    $queryClass = $this->query ?: $con->getConfig('query');
    $query = new $queryClass($con, $this->class);

    // 设置当前数据表和模型名
    if (!empty($this->table)) {
      $query->setTable($this->table);
    } else {
      $query->name($this->name);
    }

    if (!empty($this->pk)) {
      $query->pk($this->pk);
    }

    return $query;
  }

  /**
   * 获取当前模型的查询对象
   * @access public
   * @param bool      $buildNewQuery  创建新的查询对象
   * @return Query
   */
  public function getQuery($buildNewQuery = false) {
    if ($buildNewQuery) {
      return $this->buildQuery();
    } elseif (!isset(self::$links[$this->class])) {
      // 创建模型查询对象
      self::$links[$this->class] = $this->buildQuery();
    }

    return self::$links[$this->class];
  }

  /**
   * 获取当前模型的数据库查询对象
   * @access public
   * @param bool $useBaseQuery 是否调用全局查询范围
   * @param bool $buildNewQuery 创建新的查询对象
   * @return Query
   */
  public function db($useBaseQuery = true, $buildNewQuery = true) {
    $query = $this->getQuery($buildNewQuery);

    // 全局作用域
    if ($useBaseQuery && method_exists($this, 'base')) {
      call_user_func_array([$this, 'base'], [& $query]);
    }

    // 返回当前模型的数据库查询对象
    return $query;
  }

  /**
   *  初始化模型
   * @access protected
   * @return void
   */
  protected function initialize() {
    $class = get_class($this);
    if (!isset(static::$initialized[$class])) {
      static::$initialized[$class] = true;
      static::init();
    }
  }

  /**
   * 初始化处理
   * @access protected
   * @return void
   */
  protected static function init() {
    
  }

  /**
   * 设置父关联对象
   * @access public
   * @param Model $model  模型对象
   * @return $this
   */
  public function setParent($model) {
    $this->parent = $model;

    return $this;
  }

  /**
   * 获取父关联对象
   * @access public
   * @return Model
   */
  public function getParent() {
    return $this->parent;
  }

  /**
   * 设置数据对象值
   * @access public
   * @param mixed $data  数据或者属性名
   * @param mixed $value 值
   * @return $this
   */
  public function data($data, $value = null) {
    if (is_string($data)) {
      $this->data[$data] = $value;
    } else {
      // 清空数据
      $this->data = [];
      if (is_object($data)) {
        $data = get_object_vars($data);
      }
      if (true === $value) {
        // 数据对象赋值
        foreach ($data as $key => $value) {
          $this->setAttr($key, $value, $data);
        }
      } else {
        $this->data = $data;
      }
    }
    return $this;
  }

  /**
   * 获取对象原始数据 如果不存在指定字段返回false
   * @access public
   * @param string $name 字段名 留空获取全部
   * @return mixed
   * @throws InvalidArgumentException
   */
  public function getData($name = null) {
    if (is_null($name)) {
      return $this->data;
    } elseif (array_key_exists($name, $this->data)) {
      return $this->data[$name];
    } elseif (array_key_exists($name, $this->relation)) {
      return $this->relation[$name];
    } else {
      throw new InvalidArgumentException('property not exists:' . $this->class . '->' . $name);
    }
  }

  /**
   * 是否需要自动写入时间字段
   * @access public
   * @param bool $auto
   * @return $this
   */
  public function isAutoWriteTimestamp($auto) {
    $this->autoWriteTimestamp = $auto;
    return $this;
  }

  /**
   * 修改器 设置数据对象值
   * @access public
   * @param string $name  属性名
   * @param mixed  $value 属性值
   * @param array  $data  数据
   * @return $this
   */
  public function setAttr($name, $value, $data = []) {
    if (is_null($value) && $this->autoWriteTimestamp && in_array($name, [$this->createTime, $this->updateTime])) {
      // 自动写入的时间戳字段
      $value = $this->autoWriteTimestamp($name);
    } else {
      // 检测修改器
      $method = 'set' . Loader::parseName($name, 1) . 'Attr';
      if (method_exists($this, $method)) {
        $value = $this->$method($value, array_merge($this->data, $data), $this->relation);
      } elseif (isset($this->type[$name])) {
        // 类型转换
        $value = $this->writeTransform($value, $this->type[$name]);
      }
    }

    // 设置数据对象属性
    $this->data[$name] = $value;
    return $this;
  }

  /**
   * 获取当前模型的关联模型数据
   * @access public
   * @param string $name 关联方法名
   * @return mixed
   */
  public function getRelation($name = null) {
    if (is_null($name)) {
      return $this->relation;
    } elseif (array_key_exists($name, $this->relation)) {
      return $this->relation[$name];
    } else {
      return;
    }
  }

  /**
   * 设置关联数据对象值
   * @access public
   * @param string $name  属性名
   * @param mixed  $value 属性值
   * @return $this
   */
  public function setRelation($name, $value) {
    $this->relation[$name] = $value;
    return $this;
  }

  /**
   * 自动写入时间戳
   * @access public
   * @param string $name 时间戳字段
   * @return mixed
   */
  protected function autoWriteTimestamp($name) {
    if (isset($this->type[$name])) {
      $type = $this->type[$name];
      if (strpos($type, ':')) {
        list($type, $param) = explode(':', $type, 2);
      }
      switch ($type) {
        case 'datetime':
        case 'date':
          $format = !empty($param) ? $param : $this->dateFormat;
          $value = $this->formatDateTime(time(), $format);
          break;
        case 'timestamp':
        case 'integer':
        default:
          $value = time();
          break;
      }
    } elseif (is_string($this->autoWriteTimestamp) && in_array(strtolower($this->autoWriteTimestamp), [
                'datetime',
                'date',
                'timestamp',
            ])
    ) {
      $value = $this->formatDateTime(time(), $this->dateFormat);
    } else {
      $value = $this->formatDateTime(time(), $this->dateFormat, true);
    }
    return $value;
  }

  /**
   * 时间日期字段格式化处理
   * @access public
   * @param mixed $time      时间日期表达式
   * @param mixed $format    日期格式
   * @param bool  $timestamp 是否进行时间戳转换
   * @return mixed
   */
  protected function formatDateTime($time, $format, $timestamp = false) {
    if (false !== strpos($format, '\\')) {
      $time = new $format($time);
    } elseif (!$timestamp && false !== $format) {
      $time = date($format, $time);
    }
    return $time;
  }

  /**
   * 数据写入 类型转换
   * @access public
   * @param mixed        $value 值
   * @param string|array $type  要转换的类型
   * @return mixed
   */
  protected function writeTransform($value, $type) {
    if (is_null($value)) {
      return;
    }

    if (is_array($type)) {
      list($type, $param) = $type;
    } elseif (strpos($type, ':')) {
      list($type, $param) = explode(':', $type, 2);
    }
    switch ($type) {
      case 'integer':
        $value = (int) $value;
        break;
      case 'float':
        if (empty($param)) {
          $value = (float) $value;
        } else {
          $value = (float) number_format($value, $param, '.', '');
        }
        break;
      case 'boolean':
        $value = (bool) $value;
        break;
      case 'timestamp':
        if (!is_numeric($value)) {
          $value = strtotime($value);
        }
        break;
      case 'datetime':
        $format = !empty($param) ? $param : $this->dateFormat;
        $value = is_numeric($value) ? $value : strtotime($value);
        $value = $this->formatDateTime($value, $format);
        break;
      case 'object':
        if (is_object($value)) {
          $value = json_encode($value, JSON_FORCE_OBJECT);
        }
        break;
      case 'array':
        $value = (array) $value;
      case 'json':
        $option = !empty($param) ? (int) $param : JSON_UNESCAPED_UNICODE;
        $value = json_encode($value, $option);
        break;
      case 'serialize':
        $value = serialize($value);
        break;
    }
    return $value;
  }

  /**
   * 获取器 获取数据对象的值
   * @access public
   * @param string $name 名称
   * @return mixed
   * @throws InvalidArgumentException
   */
  public function getAttr($name) {
    try {
      $notFound = false;
      $value = $this->getData($name);
    } catch (InvalidArgumentException $e) {
      $notFound = true;
      $value = null;
    }

    // 检测属性获取器
    $method = 'get' . Loader::parseName($name, 1) . 'Attr';
    if (method_exists($this, $method)) {
      $value = $this->$method($value, $this->data, $this->relation);
    } elseif (isset($this->type[$name])) {
      // 类型转换
      $value = $this->readTransform($value, $this->type[$name]);
    } elseif (in_array($name, [$this->createTime, $this->updateTime])) {
      if (is_string($this->autoWriteTimestamp) && in_array(strtolower($this->autoWriteTimestamp), [
                  'datetime',
                  'date',
                  'timestamp',
              ])
      ) {
        $value = $this->formatDateTime(strtotime($value), $this->dateFormat);
      } else {
        $value = $this->formatDateTime($value, $this->dateFormat);
      }
    } elseif ($notFound) {
      $relation = Loader::parseName($name, 1, false);
      if (method_exists($this, $relation)) {
        $modelRelation = $this->$relation();
        // 不存在该字段 获取关联数据
        $value = $this->getRelationData($modelRelation);
        // 保存关联对象值
        $this->relation[$name] = $value;
      } else {
        throw new InvalidArgumentException('property not exists:' . $this->class . '->' . $name);
      }
    }
    return $value;
  }

  /**
   * 获取关联模型数据
   * @access public
   * @param Relation        $modelRelation 模型关联对象
   * @return mixed
   */
  protected function getRelationData(Relation $modelRelation) {
    if ($this->parent && get_class($this->parent) == $modelRelation->getModel()) {
      $value = $this->parent;
    } else {
      // 首先获取关联数据
      $value = $modelRelation->getRelation();
    }
    return $value;
  }

  /**
   * 数据读取 类型转换
   * @access public
   * @param mixed        $value 值
   * @param string|array $type  要转换的类型
   * @return mixed
   */
  protected function readTransform($value, $type) {
    if (is_null($value)) {
      return;
    }

    if (is_array($type)) {
      list($type, $param) = $type;
    } elseif (strpos($type, ':')) {
      list($type, $param) = explode(':', $type, 2);
    }
    switch ($type) {
      case 'integer':
        $value = (int) $value;
        break;
      case 'float':
        if (empty($param)) {
          $value = (float) $value;
        } else {
          $value = (float) number_format($value, $param, '.', '');
        }
        break;
      case 'boolean':
        $value = (bool) $value;
        break;
      case 'timestamp':
        if (!is_null($value)) {
          $format = !empty($param) ? $param : $this->dateFormat;
          $value = $this->formatDateTime($value, $format);
        }
        break;
      case 'datetime':
        if (!is_null($value)) {
          $format = !empty($param) ? $param : $this->dateFormat;
          $value = $this->formatDateTime(strtotime($value), $format);
        }
        break;
      case 'json':
        $value = json_decode($value, true);
        break;
      case 'array':
        $value = empty($value) ? [] : json_decode($value, true);
        break;
      case 'object':
        $value = empty($value) ? new \stdClass() : json_decode($value);
        break;
      case 'serialize':
        $value = unserialize($value);
        break;
      default:
        if (false !== strpos($type, '\\')) {
          // 对象类型
          $value = new $type($value);
        }
    }
    return $value;
  }

  /**
   * 设置需要追加的输出属性
   * @access public
   * @param array $append   属性列表
   * @param bool  $override 是否覆盖
   * @return $this
   */
  public function append($append = [], $override = false) {
    $this->append = $override ? $append : array_merge($this->append, $append);
    return $this;
  }

  /**
   * 设置附加关联对象的属性
   * @access public
   * @param string       $relation 关联方法
   * @param string|array $append   追加属性名
   * @return $this
   * @throws Exception
   */
  public function appendRelationAttr($relation, $append) {
    if (is_string($append)) {
      $append = explode(',', $append);
    }

    $relation = Loader::parseName($relation, 1, false);

    // 获取关联数据
    if (isset($this->relation[$relation])) {
      $model = $this->relation[$relation];
    } else {
      $model = $this->getRelationData($this->$relation());
    }

    if ($model instanceof Model) {
      foreach ($append as $key => $attr) {
        $key = is_numeric($key) ? $attr : $key;
        if (isset($this->data[$key])) {
          throw new Exception('bind attr has exists:' . $key);
        } else {
          $this->data[$key] = $model->$attr;
        }
      }
    }
    return $this;
  }

  /**
   * 设置需要隐藏的输出属性
   * @access public
   * @param array $hidden   属性列表
   * @param bool  $override 是否覆盖
   * @return $this
   */
  public function hidden($hidden = [], $override = false) {
    $this->hidden = $override ? $hidden : array_merge($this->hidden, $hidden);
    return $this;
  }

  /**
   * 设置需要输出的属性
   * @access public
   * @param array $visible
   * @param bool  $override 是否覆盖
   * @return $this
   */
  public function visible($visible = [], $override = false) {
    $this->visible = $override ? $visible : array_merge($this->visible, $visible);
    return $this;
  }

  /**
   * 解析隐藏及显示属性
   * @access protected
   * @param array $attrs  属性
   * @param array $result 结果集
   * @param bool  $visible
   * @return array
   */
  protected function parseAttr($attrs, &$result, $visible = true) {
    $array = [];
    foreach ($attrs as $key => $val) {
      if (is_array($val)) {
        if ($visible) {
          $array[] = $key;
        }
        $result[$key] = $val;
      } elseif (strpos($val, '.')) {
        list($key, $name) = explode('.', $val);
        if ($visible) {
          $array[] = $key;
        }
        $result[$key][] = $name;
      } else {
        $array[] = $val;
      }
    }
    return $array;
  }

  /**
   * 转换子模型对象
   * @access protected
   * @param Model|ModelCollection $model
   * @param                  $visible
   * @param                  $hidden
   * @param                  $key
   * @return array
   */
  protected function subToArray($model, $visible, $hidden, $key) {
    // 关联模型对象
    if (isset($visible[$key])) {
      $model->visible($visible[$key]);
    } elseif (isset($hidden[$key])) {
      $model->hidden($hidden[$key]);
    }
    return $model->toArray();
  }

  /**
   * 转换当前模型对象为数组
   * @access public
   * @return array
   */
  public function toArray() {
    $item = [];
    $visible = [];
    $hidden = [];

    $data = array_merge($this->data, $this->relation);

    // 过滤属性
    if (!empty($this->visible)) {
      $array = $this->parseAttr($this->visible, $visible);
      $data = array_intersect_key($data, array_flip($array));
    } elseif (!empty($this->hidden)) {
      $array = $this->parseAttr($this->hidden, $hidden, false);
      $data = array_diff_key($data, array_flip($array));
    }

    foreach ($data as $key => $val) {
      if ($val instanceof Model || $val instanceof ModelCollection) {
        // 关联模型对象
        $item[$key] = $this->subToArray($val, $visible, $hidden, $key);
      } elseif (is_array($val) && reset($val) instanceof Model) {
        // 关联模型数据集
        $arr = [];
        foreach ($val as $k => $value) {
          $arr[$k] = $this->subToArray($value, $visible, $hidden, $key);
        }
        $item[$key] = $arr;
      } else {
        // 模型属性
        $item[$key] = $this->getAttr($key);
      }
    }
    // 追加属性（必须定义获取器）
    if (!empty($this->append)) {
      foreach ($this->append as $key => $name) {
        if (is_array($name)) {
          // 追加关联对象属性
          $relation = $this->getAttr($key);
          $item[$key] = $relation->append($name)->toArray();
        } elseif (strpos($name, '.')) {
          list($key, $attr) = explode('.', $name);
          // 追加关联对象属性
          $relation = $this->getAttr($key);
          $item[$key] = $relation->append([$attr])->toArray();
        } else {
          $item[$name] = $this->getAttr($name);
        }
      }
    }
    return !empty($item) ? $item : [];
  }

  /**
   * 转换当前模型对象为JSON字符串
   * @access public
   * @param integer $options json参数
   * @return string
   */
  public function toJson($options = JSON_UNESCAPED_UNICODE) {
    return json_encode($this->toArray(), $options);
  }

  /**
   * 移除当前模型的关联属性
   * @access public
   * @return $this
   */
  public function removeRelation() {
    $this->relation = [];
    return $this;
  }

  /**
   * 转换当前模型数据集为数据集对象
   * @access public
   * @param array|\think\Collection $collection 数据集
   * @return \think\Collection
   */
  public function toCollection($collection) {
    if ($this->resultSetType) {
      if ('collection' == $this->resultSetType) {
        $collection = new ModelCollection($collection);
      } elseif (false !== strpos($this->resultSetType, '\\')) {
        $class = $this->resultSetType;
        $collection = new $class($collection);
      }
    }
    return $collection;
  }

  /**
   * 关联数据一起更新
   * @access public
   * @param mixed $relation 关联
   * @return $this
   */
  public function together($relation) {
    if (is_string($relation)) {
      $relation = explode(',', $relation);
    }
    $this->relationWrite = $relation;
    return $this;
  }

  /**
   * 获取模型对象的主键
   * @access public
   * @param string $name 模型名
   * @return mixed
   */
  public function getPk($name = '') {
    if (!empty($name)) {
      $table = $this->getQuery()->getTable($name);
      return $this->getQuery()->getPk($table);
    } elseif (empty($this->pk)) {
      $this->pk = $this->getQuery()->getPk();
    }
    return $this->pk;
  }

  /**
   * 判断一个字段名是否为主键字段
   * @access public
   * @param string $key 名称
   * @return bool
   */
  protected function isPk($key) {
    $pk = $this->getPk();
    if (is_string($pk) && $pk == $key) {
      return true;
    } elseif (is_array($pk) && in_array($key, $pk)) {
      return true;
    }
    return false;
  }

  /**
   * 保存当前数据对象
   * @access public
   * @param array  $data     数据
   * @param array  $where    更新条件
   * @param string $sequence 自增序列名
   * @return integer|false
   */
  public function save($data = [], $where = [], $sequence = null) {
    if (!empty($data)) {
      // 数据自动验证
      if (!$this->validateData($data)) {
        return false;
      }
      // 数据对象赋值
      foreach ($data as $key => $value) {
        $this->setAttr($key, $value, $data);
      }
      if (!empty($where)) {
        $this->isUpdate = true;
      }
    }

    // 自动关联写入
    if (!empty($this->relationWrite)) {
      $relation = [];
      foreach ($this->relationWrite as $key => $name) {
        if (is_array($name)) {
          if (key($name) === 0) {
            $relation[$key] = [];
            foreach ($name as $val) {
              if (isset($this->data[$val])) {
                $relation[$key][$val] = $this->data[$val];
                unset($this->data[$val]);
              }
            }
          } else {
            $relation[$key] = $name;
          }
        } elseif (isset($this->relation[$name])) {
          $relation[$name] = $this->relation[$name];
        } elseif (isset($this->data[$name])) {
          $relation[$name] = $this->data[$name];
          unset($this->data[$name]);
        }
      }
    }

    // 数据自动完成
    $this->autoCompleteData($this->auto);

    // 事件回调
    if (false === $this->trigger('before_write', $this)) {
      return false;
    }
    $pk = $this->getPk();
    if ($this->isUpdate) {
      // 自动更新
      $this->autoCompleteData($this->update);

      // 事件回调
      if (false === $this->trigger('before_update', $this)) {
        return false;
      }

      // 获取有更新的数据
      $data = $this->getChangedData();

      if (empty($data) || (count($data) == 1 && is_string($pk) && isset($data[$pk]))) {
        // 关联更新
        if (isset($relation)) {
          $this->autoRelationUpdate($relation);
        }
        return 0;
      } elseif ($this->autoWriteTimestamp && $this->updateTime && !isset($data[$this->updateTime])) {
        // 自动写入更新时间
        $data[$this->updateTime] = $this->autoWriteTimestamp($this->updateTime);
        $this->data[$this->updateTime] = $data[$this->updateTime];
      }

      if (empty($where) && !empty($this->updateWhere)) {
        $where = $this->updateWhere;
      }

      // 保留主键数据
      foreach ($this->data as $key => $val) {
        if ($this->isPk($key)) {
          $data[$key] = $val;
        }
      }

      if (is_string($pk) && isset($data[$pk])) {
        if (!isset($where[$pk])) {
          unset($where);
          $where[$pk] = $data[$pk];
        }
        unset($data[$pk]);
      }

      // 检测字段
      $allowFields = $this->checkAllowField(array_merge($this->auto, $this->update));

      // 模型更新
      if (!empty($allowFields)) {
        $result = $this->getQuery()->where($where)->strict(false)->field($allowFields)->update($data);
      } else {
        $result = $this->getQuery()->where($where)->update($data);
      }

      // 关联更新
      if (isset($relation)) {
        $this->autoRelationUpdate($relation);
      }

      // 更新回调
      $this->trigger('after_update', $this);
    } else {
      // 自动写入
      $this->autoCompleteData($this->insert);

      // 自动写入创建时间和更新时间
      if ($this->autoWriteTimestamp) {
        if ($this->createTime && !isset($this->data[$this->createTime])) {
          $this->data[$this->createTime] = $this->autoWriteTimestamp($this->createTime);
        }
        if ($this->updateTime && !isset($this->data[$this->updateTime])) {
          $this->data[$this->updateTime] = $this->autoWriteTimestamp($this->updateTime);
        }
      }

      if (false === $this->trigger('before_insert', $this)) {
        return false;
      }

      // 检测字段
      $allowFields = $this->checkAllowField(array_merge($this->auto, $this->insert));
      if (!empty($allowFields)) {
        $result = $this->getQuery()->strict(false)->field($allowFields)->insert($this->data);
      } else {
        $result = $this->getQuery()->insert($this->data);
      }

      // 获取自动增长主键
      if ($result && is_string($pk) && (!isset($this->data[$pk]) || '' == $this->data[$pk])) {
        $insertId = $this->getQuery()->getLastInsID($sequence);
        if ($insertId) {
          $this->data[$pk] = $insertId;
        }
      }

      // 关联写入
      if (isset($relation)) {
        foreach ($relation as $name => $val) {
          $method = Loader::parseName($name, 1, false);
          $this->$method()->save($val);
        }
      }

      // 标记为更新
      $this->isUpdate = true;

      // 新增回调
      $this->trigger('after_insert', $this);
    }
    // 写入回调
    $this->trigger('after_write', $this);

    // 重新记录原始数据
    $this->origin = $this->data;

    return $result;
  }

  protected function checkAllowField($auto = []) {
    if (true === $this->field) {
      $this->field = $this->getQuery()->getTableInfo('', 'fields');
      $field = $this->field;
    } elseif (!empty($this->field)) {
      $field = array_merge($this->field, $auto);
    } else {
      $field = [];
    }

    return $field;
  }

  protected function autoRelationUpdate($relation) {
    foreach ($relation as $name => $val) {
      if ($val instanceof Model) {
        $val->save();
      } else {
        unset($this->data[$name]);
        $model = $this->getAttr($name);
        if ($model instanceof Model) {
          $model->save($val);
        }
      }
    }
  }

  /**
   * 获取变化的数据 并排除只读数据
   * @access public
   * @return array
   */
  public function getChangedData() {
    $data = array_udiff_assoc($this->data, $this->origin, function ($a, $b) {
      if ((empty($b) || empty($b)) && $a !== $b) {
        return 1;
      }
      return is_object($a) || $a != $b ? 1 : 0;
    });

    if (!empty($this->readonly)) {
      // 只读字段不允许更新
      foreach ($this->readonly as $key => $field) {
        if (isset($data[$field])) {
          unset($data[$field]);
        }
      }
    }

    return $data;
  }

  /**
   * 字段值(延迟)增长
   * @access public
   * @param string  $field    字段名
   * @param integer $step     增长值
   * @param integer $lazyTime 延时时间(s)
   * @return integer|true
   * @throws Exception
   */
  public function setInc($field, $step = 1, $lazyTime = 0) {
    // 删除条件
    $pk = $this->getPk();

    if (is_string($pk) && isset($this->data[$pk])) {
      $where = [$pk => $this->data[$pk]];
    } elseif (!empty($this->updateWhere)) {
      $where = $this->updateWhere;
    } else {
      $where = null;
    }

    $result = $this->getQuery()->where($where)->setInc($field, $step, $lazyTime);
    if (true !== $result) {
      $this->data[$field] += $step;
    }

    return $result;
  }

  /**
   * 字段值(延迟)增长
   * @access public
   * @param string  $field    字段名
   * @param integer $step     增长值
   * @param integer $lazyTime 延时时间(s)
   * @return integer|true
   * @throws Exception
   */
  public function setDec($field, $step = 1, $lazyTime = 0) {
    // 删除条件
    $pk = $this->getPk();

    if (is_string($pk) && isset($this->data[$pk])) {
      $where = [$pk => $this->data[$pk]];
    } elseif (!empty($this->updateWhere)) {
      $where = $this->updateWhere;
    } else {
      $where = null;
    }

    $result = $this->getQuery()->where($where)->setDec($field, $step, $lazyTime);
    if (true !== $result) {
      $this->data[$field] -= $step;
    }

    return $result;
  }

  /**
   * 保存多个数据到当前数据对象
   * @access public
   * @param array   $dataSet 数据
   * @param boolean $replace 是否自动识别更新和写入
   * @return array|false
   * @throws \Exception
   */
  public function saveAll($dataSet, $replace = true) {
    if ($this->validate) {
      // 数据批量验证
      $validate = $this->validate;
      foreach ($dataSet as $data) {
        if (!$this->validateData($data, $validate)) {
          return false;
        }
      }
    }

    $result = [];
    $db = $this->getQuery();
    $db->startTrans();
    try {
      $pk = $this->getPk();
      if (is_string($pk) && $replace) {
        $auto = true;
      }
      foreach ($dataSet as $key => $data) {
        if (!empty($auto) && isset($data[$pk])) {
          $result[$key] = self::update($data, [], $this->field);
        } else {
          $result[$key] = self::create($data, $this->field);
        }
      }
      $db->commit();
      return $result;
    } catch (\Exception $e) {
      $db->rollback();
      throw $e;
    }
  }

  /**
   * 设置允许写入的字段
   * @access public
   * @param mixed $field 允许写入的字段 如果为true只允许写入数据表字段
   * @return $this
   */
  public function allowField($field) {
    if (is_string($field)) {
      $field = explode(',', $field);
    }
    $this->field = $field;
    return $this;
  }

  /**
   * 设置只读字段
   * @access public
   * @param mixed $field 只读字段
   * @return $this
   */
  public function readonly($field) {
    if (is_string($field)) {
      $field = explode(',', $field);
    }
    $this->readonly = $field;
    return $this;
  }

  /**
   * 是否为更新数据
   * @access public
   * @param bool  $update
   * @param mixed $where
   * @return $this
   */
  public function isUpdate($update = true, $where = null) {
    $this->isUpdate = $update;
    if (!empty($where)) {
      $this->updateWhere = $where;
    }
    return $this;
  }

  /**
   * 数据自动完成
   * @access public
   * @param array $auto 要自动更新的字段列表
   * @return void
   */
  protected function autoCompleteData($auto = []) {
    foreach ($auto as $field => $value) {
      if (is_integer($field)) {
        $field = $value;
        $value = null;
      }

      if (!isset($this->data[$field])) {
        $default = null;
      } else {
        $default = $this->data[$field];
      }

      $this->setAttr($field, !is_null($value) ? $value : $default);
    }
  }

  /**
   * 删除当前的记录
   * @access public
   * @return integer
   */
  public function delete() {
    if (false === $this->trigger('before_delete', $this)) {
      return false;
    }

    // 删除条件
    $pk = $this->getPk();
    if (is_string($pk) && isset($this->data[$pk])) {
      $where = [$pk => $this->data[$pk]];
    } elseif (!empty($this->updateWhere)) {
      $where = $this->updateWhere;
    } else {
      $where = null;
    }

    // 删除当前模型数据
    $result = $this->getQuery()->where($where)->delete();

    // 关联删除
    if (!empty($this->relationWrite)) {
      foreach ($this->relationWrite as $key => $name) {
        $name = is_numeric($key) ? $name : $key;
        $model = $this->getAttr($name);
        if ($model instanceof Model) {
          $model->delete();
        }
      }
    }

    $this->trigger('after_delete', $this);
    // 清空原始数据
    $this->origin = [];

    return $result;
  }

  /**
   * 设置自动完成的字段（ 规则通过修改器定义）
   * @access public
   * @param array $fields 需要自动完成的字段
   * @return $this
   */
  public function auto($fields) {
    $this->auto = $fields;
    return $this;
  }

  /**
   * 设置字段验证
   * @access public
   * @param array|string|bool $rule  验证规则 true表示自动读取验证器类
   * @param array             $msg   提示信息
   * @param bool              $batch 批量验证
   * @return $this
   */
  public function validate($rule = true, $msg = [], $batch = false) {
    if (is_array($rule)) {
      $this->validate = [
          'rule' => $rule,
          'msg' => $msg,
      ];
    } else {
      $this->validate = true === $rule ? $this->name : $rule;
    }
    $this->batchValidate = $batch;
    return $this;
  }

  /**
   * 设置验证失败后是否抛出异常
   * @access public
   * @param bool $fail 是否抛出异常
   * @return $this
   */
  public function validateFailException($fail = true) {
    $this->failException = $fail;
    return $this;
  }

  /**
   * 自动验证数据
   * @access protected
   * @param array $data  验证数据
   * @param mixed $rule  验证规则
   * @param bool  $batch 批量验证
   * @return bool
   */
  protected function validateData($data, $rule = null, $batch = null) {
    $info = is_null($rule) ? $this->validate : $rule;

    if (!empty($info)) {
      if (is_array($info)) {
        $validate = Loader::validate();
        $validate->rule($info['rule']);
        $validate->message($info['msg']);
      } else {
        $name = is_string($info) ? $info : $this->name;
        if (strpos($name, '.')) {
          list($name, $scene) = explode('.', $name);
        }
        $validate = Loader::validate($name);
        if (!empty($scene)) {
          $validate->scene($scene);
        }
      }
      $batch = is_null($batch) ? $this->batchValidate : $batch;

      if (!$validate->batch($batch)->check($data)) {
        $this->error = $validate->getError();
        if ($this->failException) {
          throw new ValidateException($this->error);
        } else {
          return false;
        }
      }
      $this->validate = null;
    }
    return true;
  }

  /**
   * 返回模型的错误信息
   * @access public
   * @return string|array
   */
  public function getError() {
    return $this->error;
  }

  /**
   * 注册回调方法
   * @access public
   * @param string   $event    事件名
   * @param callable $callback 回调方法
   * @param bool     $override 是否覆盖
   * @return void
   */
  public static function event($event, $callback, $override = false) {
    $class = get_called_class();
    if ($override) {
      self::$event[$class][$event] = [];
    }
    self::$event[$class][$event][] = $callback;
  }

  /**
   * 触发事件
   * @access protected
   * @param string $event  事件名
   * @param mixed  $params 传入参数（引用）
   * @return bool
   */
  protected function trigger($event, &$params) {
    if (isset(self::$event[$this->class][$event])) {
      foreach (self::$event[$this->class][$event] as $callback) {
        if (is_callable($callback)) {
          $result = call_user_func_array($callback, [& $params]);
          if (false === $result) {
            return false;
          }
        }
      }
    }
    return true;
  }

  /**
   * 写入数据
   * @access public
   * @param array      $data  数据数组
   * @param array|true $field 允许字段
   * @return $this
   */
  public static function create($data = [], $field = null) {
    $model = new static();
    if (!empty($field)) {
      $model->allowField($field);
    }
    $model->isUpdate(false)->save($data, []);
    return $model;
  }

  /**
   * 更新数据
   * @access public
   * @param array      $data  数据数组
   * @param array      $where 更新条件
   * @param array|true $field 允许字段
   * @return $this
   */
  public static function update($data = [], $where = [], $field = null) {
    $model = new static();
    if (!empty($field)) {
      $model->allowField($field);
    }
    $result = $model->isUpdate(true)->save($data, $where);
    return $model;
  }

  /**
   * 查找单条记录
   * @access public
   * @param mixed        $data  主键值或者查询条件（闭包）
   * @param array|string $with  关联预查询
   * @param bool         $cache 是否缓存
   * @return static|null
   * @throws exception\DbException
   */
  public static function get($data, $with = [], $cache = false) {
    if (is_null($data)) {
      return;
    }

    if (true === $with || is_int($with)) {
      $cache = $with;
      $with = [];
    }
    $query = static::parseQuery($data, $with, $cache);
    return $query->find($data);
  }

  /**
   * 查找所有记录
   * @access public
   * @param mixed        $data  主键列表或者查询条件（闭包）
   * @param array|string $with  关联预查询
   * @param bool         $cache 是否缓存
   * @return static[]|false
   * @throws exception\DbException
   */
  public static function all($data = null, $with = [], $cache = false) {
    if (true === $with || is_int($with)) {
      $cache = $with;
      $with = [];
    }
    $query = static::parseQuery($data, $with, $cache);
    return $query->select($data);
  }

  /**
   * 分析查询表达式
   * @access public
   * @param mixed  $data  主键列表或者查询条件（闭包）
   * @param string $with  关联预查询
   * @param bool   $cache 是否缓存
   * @return Query
   */
  protected static function parseQuery(&$data, $with, $cache) {
    $result = self::with($with)->cache($cache);
    if (is_array($data) && key($data) !== 0) {
      $result = $result->where($data);
      $data = null;
    } elseif ($data instanceof \Closure) {
      call_user_func_array($data, [& $result]);
      $data = null;
    } elseif ($data instanceof Query) {
      $result = $data->with($with)->cache($cache);
      $data = null;
    }
    return $result;
  }

  /**
   * 删除记录
   * @access public
   * @param mixed $data 主键列表 支持闭包查询条件
   * @return integer 成功删除的记录数
   */
  public static function destroy($data) {
    $model = new static();
    $query = $model->db();
    if (is_array($data) && key($data) !== 0) {
      $query->where($data);
      $data = null;
    } elseif ($data instanceof \Closure) {
      call_user_func_array($data, [& $query]);
      $data = null;
    } elseif (empty($data) && 0 !== $data) {
      return 0;
    }
    $resultSet = $query->select($data);
    $count = 0;
    if ($resultSet) {
      foreach ($resultSet as $data) {
        $result = $data->delete();
        $count += $result;
      }
    }
    return $count;
  }

  /**
   * 命名范围
   * @access public
   * @param string|array|\Closure $name 命名范围名称 逗号分隔
   * @internal  mixed                 ...$params 参数调用
   * @return Query
   */
  public static function scope($name) {
    $model = new static();
    $query = $model->db();
    $params = func_get_args();
    array_shift($params);
    array_unshift($params, $query);
    if ($name instanceof \Closure) {
      call_user_func_array($name, $params);
    } elseif (is_string($name)) {
      $name = explode(',', $name);
    }
    if (is_array($name)) {
      foreach ($name as $scope) {
        $method = 'scope' . trim($scope);
        if (method_exists($model, $method)) {
          call_user_func_array([$model, $method], $params);
        }
      }
    }
    return $query;
  }

  /**
   * 设置是否使用全局查询范围
   * @param bool $use 是否启用全局查询范围
   * @access public
   * @return Model
   */
  public static function useGlobalScope($use) {
    $model = new static();
    return $model->db($use);
  }

  /**
   * 根据关联条件查询当前模型
   * @access public
   * @param string  $relation 关联方法名
   * @param mixed   $operator 比较操作符
   * @param integer $count    个数
   * @param string  $id       关联表的统计字段
   * @return Relation|Query
   */
  public static function has($relation, $operator = '>=', $count = 1, $id = '*') {
    $relation = (new static())->$relation();
    if (is_array($operator) || $operator instanceof \Closure) {
      return $relation->hasWhere($operator);
    }
    return $relation->has($operator, $count, $id);
  }

  /**
   * 根据关联条件查询当前模型
   * @access public
   * @param string $relation 关联方法名
   * @param mixed  $where    查询条件（数组或者闭包）
   * @return Relation|Query
   */
  public static function hasWhere($relation, $where = []) {
    return (new static())->$relation()->hasWhere($where);
  }

  /**
   * 解析模型的完整命名空间
   * @access public
   * @param string $model 模型名（或者完整类名）
   * @return string
   */
  protected function parseModel($model) {
    if (false === strpos($model, '\\')) {
      $path = explode('\\', get_called_class());
      array_pop($path);
      array_push($path, Loader::parseName($model, 1));
      $model = implode('\\', $path);
    }
    return $model;
  }

  /**
   * 查询当前模型的关联数据
   * @access public
   * @param string|array $relations 关联名
   * @return $this
   */
  public function relationQuery($relations) {
    if (is_string($relations)) {
      $relations = explode(',', $relations);
    }

    foreach ($relations as $key => $relation) {
      $subRelation = '';
      $closure = null;
      if ($relation instanceof \Closure) {
        // 支持闭包查询过滤关联条件
        $closure = $relation;
        $relation = $key;
      }
      if (is_array($relation)) {
        $subRelation = $relation;
        $relation = $key;
      } elseif (strpos($relation, '.')) {
        list($relation, $subRelation) = explode('.', $relation, 2);
      }
      $method = Loader::parseName($relation, 1, false);
      $this->data[$relation] = $this->$method()->getRelation($subRelation, $closure);
    }
    return $this;
  }

  /**
   * 预载入关联查询 返回数据集
   * @access public
   * @param array  $resultSet 数据集
   * @param string $relation  关联名
   * @return array
   */
  public function eagerlyResultSet(&$resultSet, $relation) {
    $relations = is_string($relation) ? explode(',', $relation) : $relation;
    foreach ($relations as $key => $relation) {
      $subRelation = '';
      $closure = false;
      if ($relation instanceof \Closure) {
        $closure = $relation;
        $relation = $key;
      }
      if (is_array($relation)) {
        $subRelation = $relation;
        $relation = $key;
      } elseif (strpos($relation, '.')) {
        list($relation, $subRelation) = explode('.', $relation, 2);
      }
      $relation = Loader::parseName($relation, 1, false);
      $this->$relation()->eagerlyResultSet($resultSet, $relation, $subRelation, $closure);
    }
  }

  /**
   * 预载入关联查询 返回模型对象
   * @access public
   * @param Model  $result   数据对象
   * @param string $relation 关联名
   * @return Model
   */
  public function eagerlyResult(&$result, $relation) {
    $relations = is_string($relation) ? explode(',', $relation) : $relation;

    foreach ($relations as $key => $relation) {
      $subRelation = '';
      $closure = false;
      if ($relation instanceof \Closure) {
        $closure = $relation;
        $relation = $key;
      }
      if (is_array($relation)) {
        $subRelation = $relation;
        $relation = $key;
      } elseif (strpos($relation, '.')) {
        list($relation, $subRelation) = explode('.', $relation, 2);
      }
      $relation = Loader::parseName($relation, 1, false);
      $this->$relation()->eagerlyResult($result, $relation, $subRelation, $closure);
    }
  }

  /**
   * 关联统计
   * @access public
   * @param Model        $result   数据对象
   * @param string|array $relation 关联名
   * @return void
   */
  public function relationCount(&$result, $relation) {
    $relations = is_string($relation) ? explode(',', $relation) : $relation;

    foreach ($relations as $key => $relation) {
      $closure = false;
      if ($relation instanceof \Closure) {
        $closure = $relation;
        $relation = $key;
      } elseif (is_string($key)) {
        $name = $relation;
        $relation = $key;
      }
      $relation = Loader::parseName($relation, 1, false);
      $count = $this->$relation()->relationCount($result, $closure);
      if (!isset($name)) {
        $name = Loader::parseName($relation) . '_count';
      }
      $result->setAttr($name, $count);
    }
  }

  /**
   * 获取模型的默认外键名
   * @access public
   * @param string $name 模型名
   * @return string
   */
  protected function getForeignKey($name) {
    if (strpos($name, '\\')) {
      $name = basename(str_replace('\\', '/', $name));
    }
    return Loader::parseName($name) . '_id';
  }

  /**
   * HAS ONE 关联定义
   * @access public
   * @param string $model      模型名
   * @param string $foreignKey 关联外键
   * @param string $localKey   关联主键
   * @param array  $alias      别名定义（已经废弃）
   * @param string $joinType   JOIN类型
   * @return HasOne
   */
  public function hasOne($model, $foreignKey = '', $localKey = '', $alias = [], $joinType = 'INNER') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    $localKey = $localKey ?: $this->getPk();
    $foreignKey = $foreignKey ?: $this->getForeignKey($this->name);
    return new HasOne($this, $model, $foreignKey, $localKey, $joinType);
  }

  /**
   * BELONGS TO 关联定义
   * @access public
   * @param string $model      模型名
   * @param string $foreignKey 关联外键
   * @param string $localKey   关联主键
   * @param array  $alias      别名定义（已经废弃）
   * @param string $joinType   JOIN类型
   * @return BelongsTo
   */
  public function belongsTo($model, $foreignKey = '', $localKey = '', $alias = [], $joinType = 'INNER') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    $foreignKey = $foreignKey ?: $this->getForeignKey($model);
    $localKey = $localKey ?: (new $model)->getPk();
    $trace = debug_backtrace(false, 2);
    $relation = Loader::parseName($trace[1]['function']);
    return new BelongsTo($this, $model, $foreignKey, $localKey, $joinType, $relation);
  }

  /**
   * HAS MANY 关联定义
   * @access public
   * @param string $model      模型名
   * @param string $foreignKey 关联外键
   * @param string $localKey   关联主键
   * @return HasMany
   */
  public function hasMany($model, $foreignKey = '', $localKey = '') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    $localKey = $localKey ?: $this->getPk();
    $foreignKey = $foreignKey ?: $this->getForeignKey($this->name);
    return new HasMany($this, $model, $foreignKey, $localKey);
  }

  /**
   * HAS MANY 远程关联定义
   * @access public
   * @param string $model      模型名
   * @param string $through    中间模型名
   * @param string $foreignKey 关联外键
   * @param string $throughKey 关联外键
   * @param string $localKey   关联主键
   * @return HasManyThrough
   */
  public function hasManyThrough($model, $through, $foreignKey = '', $throughKey = '', $localKey = '') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    $through = $this->parseModel($through);
    $localKey = $localKey ?: $this->getPk();
    $foreignKey = $foreignKey ?: $this->getForeignKey($this->name);
    $throughKey = $throughKey ?: $this->getForeignKey($through);
    return new HasManyThrough($this, $model, $through, $foreignKey, $throughKey, $localKey);
  }

  /**
   * BELONGS TO MANY 关联定义
   * @access public
   * @param string $model      模型名
   * @param string $table      中间表名
   * @param string $foreignKey 关联外键
   * @param string $localKey   当前模型关联键
   * @return BelongsToMany
   */
  public function belongsToMany($model, $table = '', $foreignKey = '', $localKey = '') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    $name = Loader::parseName(basename(str_replace('\\', '/', $model)));
    $table = $table ?: Loader::parseName($this->name) . '_' . $name;
    $foreignKey = $foreignKey ?: $name . '_id';
    $localKey = $localKey ?: $this->getForeignKey($this->name);
    return new BelongsToMany($this, $model, $table, $foreignKey, $localKey);
  }

  /**
   * MORPH  MANY 关联定义
   * @access public
   * @param string       $model 模型名
   * @param string|array $morph 多态字段信息
   * @param string       $type  多态类型
   * @return MorphMany
   */
  public function morphMany($model, $morph = null, $type = '') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    if (is_null($morph)) {
      $trace = debug_backtrace(false, 2);
      $morph = Loader::parseName($trace[1]['function']);
    }
    $type = $type ?: Loader::parseName($this->name);
    if (is_array($morph)) {
      list($morphType, $foreignKey) = $morph;
    } else {
      $morphType = $morph . '_type';
      $foreignKey = $morph . '_id';
    }
    return new MorphMany($this, $model, $foreignKey, $morphType, $type);
  }

  /**
   * MORPH  One 关联定义
   * @access public
   * @param string       $model 模型名
   * @param string|array $morph 多态字段信息
   * @param string       $type  多态类型
   * @return MorphOne
   */
  public function morphOne($model, $morph = null, $type = '') {
    // 记录当前关联信息
    $model = $this->parseModel($model);
    if (is_null($morph)) {
      $trace = debug_backtrace(false, 2);
      $morph = Loader::parseName($trace[1]['function']);
    }
    $type = $type ?: Loader::parseName($this->name);
    if (is_array($morph)) {
      list($morphType, $foreignKey) = $morph;
    } else {
      $morphType = $morph . '_type';
      $foreignKey = $morph . '_id';
    }
    return new MorphOne($this, $model, $foreignKey, $morphType, $type);
  }

  /**
   * MORPH TO 关联定义
   * @access public
   * @param string|array $morph 多态字段信息
   * @param array        $alias 多态别名定义
   * @return MorphTo
   */
  public function morphTo($morph = null, $alias = []) {
    $trace = debug_backtrace(false, 2);
    $relation = Loader::parseName($trace[1]['function']);

    if (is_null($morph)) {
      $morph = $relation;
    }
    // 记录当前关联信息
    if (is_array($morph)) {
      list($morphType, $foreignKey) = $morph;
    } else {
      $morphType = $morph . '_type';
      $foreignKey = $morph . '_id';
    }
    return new MorphTo($this, $morphType, $foreignKey, $alias, $relation);
  }

  public function __call($method, $args) {
    $query = $this->db(true, false);

    if (method_exists($this, 'scope' . $method)) {
      // 动态调用命名范围
      $method = 'scope' . $method;
      array_unshift($args, $query);
      call_user_func_array([$this, $method], $args);
      return $this;
    } else {
      return call_user_func_array([$query, $method], $args);
    }
  }

  public static function __callStatic($method, $args) {
    $model = new static();
    $query = $model->db();

    if (method_exists($model, 'scope' . $method)) {
      // 动态调用命名范围
      $method = 'scope' . $method;
      array_unshift($args, $query);

      call_user_func_array([$model, $method], $args);
      return $query;
    } else {
      return call_user_func_array([$query, $method], $args);
    }
  }

  /**
   * 修改器 设置数据对象的值
   * @access public
   * @param string $name  名称
   * @param mixed  $value 值
   * @return void
   */
  public function __set($name, $value) {
    $this->setAttr($name, $value);
  }

  /**
   * 获取器 获取数据对象的值
   * @access public
   * @param string $name 名称
   * @return mixed
   */
  public function __get($name) {
    return $this->getAttr($name);
  }

  /**
   * 检测数据对象的值
   * @access public
   * @param string $name 名称
   * @return boolean
   */
  public function __isset($name) {
    try {
      if (array_key_exists($name, $this->data) || array_key_exists($name, $this->relation)) {
        return true;
      } else {
        $this->getAttr($name);
        return true;
      }
    } catch (InvalidArgumentException $e) {
      return false;
    }
  }

  /**
   * 销毁数据对象的值
   * @access public
   * @param string $name 名称
   * @return void
   */
  public function __unset($name) {
    unset($this->data[$name], $this->relation[$name]);
  }

  public function __toString() {
    return $this->toJson();
  }

  // JsonSerializable
  public function jsonSerialize() {
    return $this->toArray();
  }

  // ArrayAccess
  public function offsetSet($name, $value) {
    $this->setAttr($name, $value);
  }

  public function offsetExists($name) {
    return $this->__isset($name);
  }

  public function offsetUnset($name) {
    $this->__unset($name);
  }

  public function offsetGet($name) {
    return $this->getAttr($name);
  }

  /**
   * 解序列化后处理
   */
  public function __wakeup() {
    $this->initialize();
  }

  /**
   * 模型事件快捷方法
   * @param      $callback
   * @param bool $override
   */
  protected static function beforeInsert($callback, $override = false) {
    self::event('before_insert', $callback, $override);
  }

  protected static function afterInsert($callback, $override = false) {
    self::event('after_insert', $callback, $override);
  }

  protected static function beforeUpdate($callback, $override = false) {
    self::event('before_update', $callback, $override);
  }

  protected static function afterUpdate($callback, $override = false) {
    self::event('after_update', $callback, $override);
  }

  protected static function beforeWrite($callback, $override = false) {
    self::event('before_write', $callback, $override);
  }

  protected static function afterWrite($callback, $override = false) {
    self::event('after_write', $callback, $override);
  }

  protected static function beforeDelete($callback, $override = false) {
    self::event('before_delete', $callback, $override);
  }

  protected static function afterDelete($callback, $override = false) {
    self::event('after_delete', $callback, $override);
  }

  /**
   *  自动获取用户性息
   */
  protected function set_user_info() {
    $module = strtolower(request()->module());
    if (strtolower(request()->module()) == 'babyadmin') {
      $module = 'admin';
    }
    $this->user_data['username'] = session($module . '_userusername'); //用户名
    $this->user_data['uid'] = session($module . '_useruid'); //用户id
    $this->user_data['model'] = $module; //操作model
  }

}
